I’m adding some more information regarding Outlook latency causes that can be on the Desktop side.
> Outlook 2007/2010 – More precisions about Antivirus exclusions and things that can slow down your messaging client in general
> Plan antivirus scanning for Outlook 2010
- We recommend that you turn off scanning of the following Microsoft Outlook files:
*.oab (Outlook address book files)
%userprofile%\AppData\Local\Microsoft\Outlook\Offline Address Books\<guid>
*.srs (send/receive settings files)
Navigation pane settings file profile_name.xml files
where <profile name> is the name of the Outlook messaging profile, as shown in the Control Panel, Mail applet.
outlprnt (print styles)
- If you use antivirus software to perform file-level scanning [Outlook files], while Outlook is in use, data corruption issues might result.
- We we do not recommend that you scan *.pst, *.ost, and other Outlook files directly. Instead, we recommend that you scan email message attachments on the email server and on the Outlook client computer.
> How to troubleshoot performance issues in Outlook 2010
- The performance issues may be caused by one or more of the following:
- Insufficient computer specifications
- Absence of the latest service pack for Outlook 2010
- Large Personal Folders files (.pst) or Offline Folder files (.ost)
- Outlook .ost files or .pst files that are stored on a drive with insufficient write performance
- Third-party add-ins
- Gadgets that access Outlook data (Windows Vista only)
- Microsoft Office Communicator integration
- Antivirus software interaction
- Windows Desktop Search indexing
- Incomplete closure of .pst files or .ost files
- POP3 accounts on Windows Vista clients
- Many Really Simple Syndication (RSS) feeds
- To-Do Bar and Online mode with Exchange server
- Damaged Outlook messaging profile