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Data Repair Tools Article | Fix Outlook Error 0x8004060c while Trying to Send/Receive Email

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Fix Outlook Error 0x8004060c while Trying to Send/Receive Email

Email | 7 min read| Brayden Mitchell | Updated On - May 31, 2023

Summary: Outlook error 0x8004060c basically make the Outlook mailbox inaccessible and at times also disrupt the communication. This article will help to discover the ways through

which this error can be solved and at the same time fixed for sure.

MS Outlook is a useful email platform which many organizations are using these days due to its simplified user interface and other friendly features. Microsoft is trying  to improve the Outlook by getting away with the inherent bugs which at times affect the very functioning of the application.

There are the numbers of issues faced by the professionals while using the email platform, but the most notorious issue when a user tries to send or receive emails through the exchange server.. You must have seen the following messages in the dialog box.

-Task “Microsoft Exchange Server – Sending” reported error (0x8004060c): ‘The message store has reached its maximum size. To reduce the amount of data in this message store select some items that you no longer need and permanently delete them.’

-Task “Email Address- Sending and Receiving” reported error (0x8004060c): ‘Unknown Error 0x8004060c.’

-Task “Microsoft Exchange Server- Receiving” reported error (0x8004060c): ‘Unknown Error 0x8004060c.’

Microsoft Exchange Server - Sending" reported error (0x8004060c)

Manifestation of Outlook Error 0x8004060c While Trying to Send/Receive Email

This error is surely the reason behind many failed email communications. It can be fixed with the help of the self-executory steps and at the same time may require the support of a third party software. However, before fixing this issue it is important to know the reason behind it. Many professionals suggest following reasons for the occurrence of Outlook Error 0x8004060c:

  • Corruption of OST files due to excessive file size.
  • Technical snags in Exchange Server.
  • Network issue gives rise to synchronization problem that leads to error (0x8004060c).
  • PST file size exceeding the file size limit.

So it can be clearly inferred that there may be many reasons which are responsible for the occurrence of Outlook Error 0x8004060c. Thus, before moving to the resolution users must know how to technically handle the situation.

How to resolve Outlook Error 0x8004060c manually?

To resolve the error (0x8004060c) manually, many simple steps can be taken into accord. It includes the knowledge of location of registry files, methods to reduce the OST and PST file size and file size limitations.

The issues related to Outlook Error 0x8004060c can be resolved in following ways:

  1. Resetting mailbox maximum capacity by altering registry files.
  2. Compacting OST/PST file size.
  3. Create new files to archive the data from the old ones.
  4. Splitting oversized files to reduce 2 GB truncation error.

These solutions are explained as follows:

#1. Resetting Registry Files

To enhance the Outlook message capacity ,the Windows registry limits must be enhanced. To do so user has to undertake the following steps:

  • Press Windows+R and open RUN Windows. Type regedit and click OK to open the Registry Editor.
    Type regedit and click OK to open the Registry Editor
  • In Windows Registry look for the following path depending upon the variant of Outlook being used.
    For Standard users:
    -Outlook 2013: HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\PST
    -Outlook 2010: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\PST
    -Outlook 2007: HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\PST
    -Outlook 2003: HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\PST
    For Domain Administrators: (Group Policy)
    -Outlook 2013: HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\15.0\Outlook\PST
    -Outlook 2010: HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\14.0\Outlook\PST
    -Outlook 2007: HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Outlook\PST
    -Outlook 2003: HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\11.0\Outlook\PST
  • If the PST key doesn’t exist, then right-click at Outlook key and select New -> Key and give the name to the key.
    If the PST key doesn’t exist, then right-click at Outlook key and select New
    Key and give the name to the key
  • Click at the PST key and look for MaxLargeFileSize and WarnLargeFileSize.
    Click at the PST key
  • Double click to open MaxLargeFileSize value. Select Decimal. At the Value Data box set the new decimal value to maximum size limits. For Outlook 2003 and 2007 user can specify till 20 GB; For Outlook 2010 and 2013, the maximum limit is 50 GB. Once done select OK.
    Double click to open MaxLargeFileSize value
  • Then click WarnLargeFileSize. Select Decimal followed by entering value into the value box. The Warning size should be 95% of the MaxLargeFileSize value entered before. Select OK.
    Then click WarnLargeFileSize
  • Close the registry files. You have successfully changed the registry settings and expanded the Outlook mailbox saving capacity.

#2. Compacting OST/PST Files

Before compacting the size of OST/PST files, user must check the Outlook version they are using. For Outlook 2007 users, open the Tools menu, while Outlook 2010 users must open the File Tab on the ribbon click Info and Choose the Account Settings.

Before entering into compaction of OST/PST files, user must check the Outlook version

  • Click Account Settings->Microsoft Exchange-> More Settings-> Advance tab->click on Offline Folder File.
  • Click Compact Now.
    Click Compact Now
  • The compaction of OST and PST has been success fully done.

#3. Recreating OST Files

To recreate OST files user has to follow these steps:

  • Close the Outlook application.
  • From Control Panel go to Mail Setup dialog box and select the profiles by clicking on Show Profiles.
  • Now click Properties->Mail. From Mail go to E-mail tab-> Exchange Account-> change button.
  • Uncheck Use Cached Exchange Mode check box. Click More Settings ->Advanced Tab->Offline Folder File Settings-> Disable Offline Use.
  • After clicking Disable Offline button, click Yes to confirm.
  • Click Offline Folder File Settings-> click Ok.
  • In dialog box click Yes. Check the Use Cached Exchange Mode from the settings followed by OK->Next->Finish.

Note: Users can also try recreating the .ost file in case the file is corrupted by deleting the file from its location (find it through Account Settings in Outlook or directly going to C:\Users\Username\AppData\Local\Microsoft\Outlook) and then restart the Outlook application with configured Exchange Server account to create a fresh updated .ost file.

#4. Splitting oversized file to reduce 2GB Truncation error

This is the best way to reduce the OST size and eliminate the unwanted mailbox entries.

  • Open Scanost.exe from the default location –
    :\Program Files\Microsoft Office\
  • Double click on the OST file to be reduced. Hit Enter.
  • Now, open the truncated file with Scanost.exe tool.
  • Once done, click again on the file to conform its truncation. If the concerned file does not get open then redo the process once more.

Also, try archiving the old .ost emails based on time filter using the Archive option in the Cleanup Tools feature in the Outlook application to a desired file location. There is a separate AutoArchive feature in the Outlook options using which you can decide the archiving frequency, the saving destination of the old records, deleting actions on old items (delete on every –time or permanently delete old items, etc.
Archiving the old .ost emails based on time filter

There are chances that the file Outlook Error 0x8004060c may get resolved with such solutions; however, there may be a single percent chance of failure. In such cases the user can take assistance from a reliable third-party tool like OST to PST Tool. To evaluate the performance of the tool, the trail version can be tried that exactly works like the licensed version with varied success rate. Upon satisfaction with its performance user can purchase the licensed version without any delay. Just try once before undertaking the planned execution.


It can be concluded all of these methods have been tried and tested to fix Outlook Error 0x8004060c. so far and have been able to provide the desired results to the users. They have been successfully incorporated in one or the other way and provide great results to the users.

3 thoughts on “Fix Outlook Error 0x8004060c while Trying to Send/Receive Email”

  1. I got this error when I was trying to send emails from Outlook. This post explains all of the possible methods in detail and beautifully so that anyone can benefit from these manual methods without difficulty. These methods help me a lot to fix this error effectively. I thank the entire team for sharing this wonderful article.

  2. I was facing this issue due to connectivity with Exchange Server. After fixing it, I found that my OST file was corrupted. This article helped me a lot. Thank you.

  3. When I send an e-mail to my friend, I suddenly get an error message 0x8004060c. As a user, I began to research manual methods. Then I found a more recent and technical article suggested by different methods that helped me fix this error. Thanks for sharing this article.

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