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Problem was not related to Outlook in the end. &nbsp;Useful tips from expert so points awarded, but question not possible to answer correctly as it was a 3rd party problem.
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Problem was not related to Outlook in the end.  Useful tips from expert so points awarded, but question not possible to answer correctly as it was a 3rd party problem.

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We have a number of clients using Outlook 2007 with IMAP mailboxes. &nbsp;Recently our ISP &nbsp;made some changes to their mail servers, since when we are seeing the following problems:<br />
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Some (but not all) users do not have their mailboxes updated. &nbsp;Renaming the .PST file or creating a new Outlook profile fixes the problem, but only temporarily; &nbsp;within a day the problem is back. &nbsp;Thunderbird and BlackBerry clients are not affected and always work fine.<br />
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The ISP assures us that their servers conform to IMAP specifications and are working correctly. &nbsp;Outlook 2007 is patched to SP2 and all later updates through MS Update. &nbsp;POP3 accounts work correctly in Outlook.<br />
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Any ideas appreciated!
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We have a number of clients using Outlook 2007 with IMAP mailboxes.  Recently our ISP  made some changes to their mail servers, since when we are seeing the following problems:

Some (but not all) users do not have their mailboxes updated.  Renaming the .PST file or creating a new Outlook profile fixes the problem, but only temporarily;  within a day the problem is back.  Thunderbird and BlackBerry clients are not affected and always work fine.

The ISP assures us that their servers conform to IMAP specifications and are working correctly.  Outlook 2007 is patched to SP2 and all later updates through MS Update.  POP3 accounts work correctly in Outlook.

Any ideas appreciated!

Outlook 2007 no longer updates IMAP mailbox

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.

Email Clients

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.