# Mail Server Adapter Types

NuPoint Unified Messaging supports the IMAP messaging protocol as adapter types for connecting to email servers for voice mail synchronization and Text-to-Speech (TTS).

## IMAP

The IMAP connector, which is deployed by default on NuPoint Unified Messaging, supports Microsoft Exchange Server 2010, 2013, 2016, and 2019, Microsoft Office 365 and Google Apps. The IMAP connector only supports one email server so it is targeted for small and medium-sized companies with one email server. Up to 1500 Advanced UM users are supported with Exchange and upto 750 Advanced UM users are supported with Office 365, and up to 2500 users are supported with Google Apps (Gmail). If your enterprise has more than 1500 users and is using Exchange, use a MAPI Gateway to connect to the server.

To set up the email server for IMAP, see the following procedures:

- Configure IMAP for Exchange/Office 365

- Configure IMAP for Google Apps

Note: In most cases, voice mail messages are sent immediately to the email server and then forwarded to the Advanced UM users. However, hosted email configurations such as Google Apps may experience slight delays due to virus scanning, anti-spam software, or routing delays caused by traffic volume. As a result, the timestamps of the original voice mail message and email audio attachment may not match.