IBM DB2
 I am aware of the existence of DB2 from a long time ago and also on the help file for Lotus Domino Administrator you can see guides on how to connect Lotus Domino with DB2 so I downloaded a trial version to check it out.

IBM DB2 is a relational model database server developed by IBM. There are three main products in the DB2 family: DB2 for LUW (Linux, Unix, and Windows), DB2 for z/OS (mainframe), and DB2 for iSeries (formerly OS/400). The DB2 LUW product runs on multiple Linux and UNIX distributions, such as Red Hat Linux, SUSE Linux, AIX, HP/UX, and Solaris, and most Windows systems. DB2 also powers the IBM InfoSphere Warehouse edition, which is basically DB2 LUW with DPF (Database Partitioning Feature), a massive parallel share-nothing data warehousing architecture.

 

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Lotus Notes Gmail A Mail (IMAP) database is a local database that allows you to interact with an IMAP server by reading and manipulating messages and folders in your IMAP mailbox.  You can also work disconnected from the network and then later re-syncronize with the IMAP server.
To use the Mail (IMAP) database, you need to first create an Internet Account document.  When you save the Internet Account document, a Mail (IMAP) database is automatically created.

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