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First published by Pratik Vyas [MVP] (eMV)
When: 21 May 2012 10:22 PM
Last revision by Richard Mueller (cMVP, Microsoft Community Contributo)
When: 18 Sep 2013 9:04 AM
Revisions: 5
Comments: 3

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SharePoint 2007: Connect to Outlook is Missing in SharePoint Calendar

A very common & known issue while migrating IE versions. There is couple of steps and checking should be done to get this resolved.

Make sure a single Office instance installed either 2003 or 2007 not both. In case you found a single instance of another version try below step.
Manually unregister and register the owssupp.dll with regsvr32 , if this will not resolve your issue try below step.
Enable add-on called “SharePoint Stssync Handler” in Internet Explorer. Go to Tools > Manage Add-Ons and look for add-ons called “SharePoint Stssync Handler” if disabled, Enable it. If enabled, disable it restart IE and re-enable it. Still getting issue try below one.

SharePoint Services Support feature should be installed on the machine.Control Panel > Microsoft Office > Change > Add or Remove features and add WSS features

For more on SharePoint STSSYNCHANDLER: Connect to Outlook to synchronize lists: