Having an exchange storage solution is essential for anybody in business today.  There are compelling reasons why you need to have this issue in hand.

Recovery from disk is much faster than tape recovery. Tape recovery is slow and the risk of failure is too great to make this an efficient recovery method. By using SaaS solutions, it is now economically feasible to maintain a full Exchange storage backup for recovery purposes.

Mailbox recovery: While tape backup solutions address the recovery of full messaging databases, recovery of individual mailboxes has not been solved in any scalable way. An 'offshore' approach significantly improves Exchange recovery, and is flexible and supports recovery at all levels, including full database, mailbox and message level restores.

E-mail discovery: Auditors must be able to perform searches across multiple mailboxes, in order to comply with a legal discovery request or regulatory investigation. An SaaS email management server can support flexible discovery of messages across multiple attributes, including full-text search of email messages and attachments.

Reduced store size: The growing use of attachments is resulting in unmanageable mailbox sizes. One way to reduce the store size is to remove the storage from the Exchange server so it doesn't have to process them.

Retention and disposition enforcement: Most companies have established policies for retention and disposition of email. A SaaS solution for email management allows for consistent enforcement of policies that are automated and policy-based.