This situation however is extremely rare since the default maintenance time on Exchange is at AM and updates and downloads are usually performed during working hours.Even though Outlook is the last in the chain, it is often the first level where the troubleshooting takes place as usually this is where the request is coming from.But also note that even though you may have a newer version of Outlook, the Exchange Server version your company runs behind your Outlook is invisible to you, and it could be quite old and so still subject to this issue.Many IT departments are slow to upgrade their server software, so check with your IT department to confirm the version (more on which versions are effected below).Note that we highly recommend using the switch instead of deleting the file directly.A Microsoft Outlook Most Valuable Professional (MVP) since 1999, Diane is the author of several books, including Outlook 2013 Absolute Beginners Book.
October 5, 2012 Has your Exchange-based Outlook mail client performance gotten slower over time? Or do you often get a message saying something like “Requesting data from Microsoft Exchange Server” that is slow to clear before you see your mail update?This is called the Offline Address Book and is being generated on the Exchange server.Due to various synching schedules, it can take up to 48 hours before you could actually see a change in Outlook after a modification has been made on the Exchange server or in Active Directory.Nearly all my books and classes discuss the huge benefits of doing this, so I won’t repeat the reasons here (for more online information about how I use the Processed Mail folder, see this article). Microsoft has an article on this and it states the limit is directly determined by the version of your Exchange Server.But obviously that single-folder filing approach could make you more prone to reaching the Exchange single-folder item countlimit (again, if using an old Exchange server); any one folder loaded with lots of items, like the Processed Mail folder, can cause the problem. According to that article, if you have Exchange Server 2003 or 2000, the limit will be somewhere around 2,500 to 5,000 items in one folder.