We have several WIN7 Pro clients in a small office that use Outlook 2010 with Microsoft off-site hosted Exchange mail services. For the most part all works well. A couple of weeks ago one user started to experience a problem of Outlook taking 10 minutes plus to open when it is first started after a reboot of the computer.
I did an Outlook repair through Add/Remove programs and also made sure no obsolete/unnecessary add-ins are enabled in Outlook. The problem persists. The local OST file is under 10 GB.
The work around is to kill the Outlook process through the task manager and then on the next start of Outlook it opens fast/normally. Subsequent Outlook restarts also open normally. The trigger seems to be rebooting the computer.
The computers are all on a workgroup, not a domain. No viruses and everything else seems to be running well. Other computers in the office are not having this problem.
I suspect it may be the antivirus software interrogating the OST file at first startup.