In mixed-mode email environments that use both Lotus Notes Domino and Microsoft Exchange Server, Outlook Web Access...
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(OWA) will not recognize URL links to Lotus Notes documents contained in Exchange Server 2003 email.
When Lotus Notes document links -- denoted by notes:// -- become disabled, OWA users must copy and paste the URL text into a Web browser to access the Lotus Notes documents.
Microsoft's Knowledge Base article 939999, "A URL that includes a 'notes:' prefix does not work in Outlook Web Access for Exchange 2003," describes this Lotus Notes/Microsoft Exchange interoperability problem and also offers a solution.
This isn't a Lotus Notes-specific issue, however. It has more to do with the fact that OWA will filter, by default, any protocol URL types that aren't part of a known "safe" list.
This list contains all of the obvious protocol types -- http:, https:, mailto:, and so forth -- and a few that are Microsoft-specific, such as msdaipp:. Outlook Web Access in Exchange 2003 does not recognize the notes: prefix as safe protocol link.
If you're using a Lotus Notes server in a mixed-mode Exchange Server environment, you'll want to restore access to notes: links in Outlook Web Access. You will need to edit the registry on your Exchange server to do this.
\MSExchangeIS\ParametersSystem\InternetContent, create a new Multi-String Value with the name AdditionalSafeURLScheme. Set the value to NOTES. You can add more protocols by comma-delineating them.
NOTE: If you have a front-end/back-end environment, you'll need to configure this change on both the front-end and back-end servers. Also, this only works on Exchange Server 2003 Service Pack 2 (SP2) or higher.
About the author: Serdar Yegulalp is editor of Windows Insight, a newsletter devoted to hints, tips, tricks, news and goodies for all flavors of Windows users.
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