Relevant Product: Signature Manager Exchange Edition
You have enabled the Sent Items Update feature in Exclaimer Signature Manager Exchange Edition so that a signature is visible when the sender views an email in their Sent Items folder.
When Cached Exchange Mode is enabled in Microsoft Outlook, no signature is visible on the sent item.
If the same sent item is viewed in Outlook Web Access or if the Cached Exchange Mode is disabled, then the signature is visible on the sent item.
There can be various reasons that can result in this behaviour, such as large mailboxes or Outlook Data file (.OST files), or particular add-ins installed in Microsoft Outlook.
When Microsoft Outlook has Cached Exchange Mode enabled, in some cases the data visible in the Sent Items folder is not the most up to date data that is visible in the mailbox on the Microsoft Exchange server. Instead, the data being displayed resides on the user’s local computer in an Outlook Data file (.OST).
If Microsoft Outlook has not synchronized data from the mailbox to the OST file or vice versa, the data displayed in Microsoft Outlook will be out of date and not the most recent. When Microsoft Outlook is synchronized with the mailbox, then the most up to date data will be displayed to the user.
The Sent Items Update feature will only update the sent item that resides in the user’s mailbox on the Microsoft Exchange server.
You can confirm if the Sent Items Update feature has updated the sent item or if Microsoft Outlook is displaying out of date data by logging into the user’s mailbox using Outlook Web Access.
If reducing the size of the Sent Items folder or disabling Microsoft Outlook add-ins does not resolve the issue, further investigation will be required in this environment to identify why Microsoft Outlook has not synchronized with the Microsoft Exchange server.