One of my teammates is out of office and has forgot to activate the same.
this impacts my business as my customers are not aware of the same. Is there
any way to do this?
Only when you have full access rights (owner permissions set via Outlook
don't count) to that mailbox. Then you can logon to OWA to set the OOF or
create a mail profile with that mailbox as the primary mailbox.

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Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
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Real World Questions, Real World Answers
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> One of my teammates is out of office and has forgot to activate the same.
> this impacts my business as my customers are not aware of the same. Is
> there
> any way to do this?