ost file you may also refer to this article. ost files has a preconfigured limit of 50 gigabytes (GB), it is also possible to increase this limit, however, Microsoft recommends avoiding Outlook data files growing larger than 10 GB. Read the Microsoft KB article on the connection between Outlook data file size and Outlook behavior for more information. If you wish to increase the limit of your. The larger this file is, the higher the chances that it might get corrupted or might affect Outlook performance. Usually, it happens to large mailboxes and, subsequently, large Outlook data files that are stored locally on the machine and are accessed every time Outlook tries to retrieve the mailbox data from the server. If you have already checked that webmail works fine and noticed that there is an improvement in Outlook performance in Online Mode, it is likely that your mail client is having difficulties working in Cached Exchange Mode. In some cases, it means that you will need to troubleshoot connectivity issues.

Outlook is retrieving data from the Microsoft Exchange Server.

Requesting data from Microsoft Exchange Server.

When such an issue occurs, Outlook users may receive one of the following messages:

This article will help you diagnose and resolve issues where users of Microsoft Outlook experience poor performance when working with Microsoft Exchange Server.

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