Having a large Outlook PST file is never recommended. Not only does it increase the chances of PST corruption, it can also make Outlook slow while performing operations like, sending e-mail, receiving e-mail, or even while opening an e-mail. In Outlook 2007, this slow behavior is most likely to occur when the file is 4 GB or larger in size. Owing to this, Outlook starts behaving abruptly and sometimes, throws error messages. One of the most commonly adopted solutions in this respect is to Split PST File. Certainly other options are also available, including deleting unnecessary messages and compacting PST file.
The slow behavior in MS Outlook 2007 can also be attributed to some computer-related concerns. Many Outlook 2007 users often report that they receive the below or similar kind of error message when working with the application or while opening it:
Task 'task_name'- Sending and Receiving' reported error (0x8007000E) : 'Out of memory or system resources. Close some windows or programs and try again.'
The 'task_name' refers to the name of task that Outlook is unable to complete.
Microsoft Outlook 2007 might show 'Out of memory' errors in the following two situations:
(1) Your computer is short of resources. It does not has required memory or there exists some motherboard issues.
(2) MS Outlook is using a very large PST file
Tips of Recovery
To troubleshoot the behavior, you need to check if other applications are also running slow. If yes, then the problem is related to your computer, and not with your Outlook application. You can increase the system memory and also try replacing the motherboard.
If implementing the above system changes doesn't bring any considerable improvement in Outlook's performance, you need to reduce the PST file size by one or more of the below tips:
(1) Delete undesired e-mails, empty the 'Deleted Items' folder, and later, compact the PST.
(2) Archive your PST by moving old e-mails to a different PST.
(3) Use a Split PST softwareto divide the large sized PST file into smaller PST files.
Stellar Phoenix PST File Splitter is an advanced utility that can split Outlook data file (*.pst) on the basis of e-mail ID and message date. This Split PST File software supports MS Outlook 2007, 2003, 2002, and 2000 and is effective in preserving the originality of file data. The software can divide a large PST into small PST files, which can be directly imported into Outlook.