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| U | 
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|   | uid attribute (   ) | 
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|   | unauthorized mail relaying (   ) | 
|   | 
|   | understanding | 
|   |   | business requirements (   ) | 
|   |   | Connector for Microsoft Outlook pre-installation requirements (   ) | 
|   |   | Messaging Server topology elements (   ) | 
|   |   | remote site failover (   ) | 
|   |   | schema and provisioning options (   ) | 
|   |   | service tiers (   ) | 
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|   | uptime calculation (   ) | 
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|   | URL | 
|   |   | embedded in instant message (   ) | 
|   |   | Instant Messaging applet (   ) | 
|   | 
|   | usage patterns (   ) (   ) (   ) | 
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|   | usage profile | 
|   |   | defining for Instant Messaging (   ) | 
|   |   | determining for Messaging Server (   ) | 
|   | 
|   | users | 
|   |   | authenticating in LDAP (   ) | 
|   |   | heavyweight POP (   ) | 
|   |   | lightweight IMAP users (   ) | 
|   |   | lightweight POP (   ) | 
|   |   | mediumweight IMAP (   ) | 
|   |   | mediumweight Messenger Express (   ) |