In a sense, Microsoft Outlook and Microsoft Exchange can treat voice mail as just another form of e-mail, delivering messages to the Inbox. Unless otherwise noted, these add-ins do not work with Outlook 98 or Outlook 2000 in Internet Mail Only mode. They may not work with Outlook 2010 64-bit.
Personal Voice Mail Services
These services use the modem on a desktop computer.
Whether or not you can receive voice mail directly on your PC is largely a factor of the type of modem you have. In general, you need a modem that supports the full Unimodem V standard. Many such modems come with their own standalone voice mail program that doesn’t integrate with Outlook.
Voice telephony software that displays Outlook contacts using CallerID, creates new contact records where needed and delivers incoming voice mail and faxes to your Outlook Inbox.
Integrates voice mail and fax with either Exchange and Outlook. Also notifies your pager of incoming messages and allows you to compose pager messages. Logs incoming and outgoing calls and supports Caller ID.
Enterprise Voice Mail Systems
These services are for organizations using Exchange Server.
They either integrate directly with the Exchange Server, which means little or no change to the client is required, or use a separate service in the Exchange/Outlook profile to make the connection to a voice mail server. This is by no means a complete list of those available. Some of them include client Caller ID support, fax support, SMS, etc.
Various services that provide you with calendar and contacts, with Outlook sync, plus a mail account, voicemail, and send and receive faxes.
Active Voice's Repartee Unified Messaging System provides small and mide-size businesses flexible message management from the desktop, telephone or Internet. Whether you're in the office or on the road, you can increase responsiveness by accessing your voice, fax and e-mail messages from one convenient inbox and by handling real-time calls as you receive them. Solutions available for large enterprises and video mail services.