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If they are internal users then your email client should hold them in the outbox until it connects with the server. If it's an external user they it would depend on the SMTP server sending it and how many times it may try resending before it just stops.
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If they are internal users then your email client should hold them in the outbox until it connects with the server. If it's an external user they it would depend on the SMTP server sending it and how many times it may try resending before it just stops.

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Trying to steal my thunder? ;)
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What happens to the pending messages in the Exchange Server message queues during a reboot.<br />
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Are they deleted and the sender resubmits or are they purged and lost forever, or do they just get re-processed after the reboot?
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What happens to the pending messages in the Exchange Server message queues during a reboot.

Are they deleted and the sender resubmits or are they purged and lost forever, or do they just get re-processed after the reboot?

message queues during reboot

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.