The best replacement for mapi is imap.

The best alternatives to mapi are rated as following:
★★★★★  imap
★★★★  smtp
★★★  pop3
★★  outlook anywhere
★  activesync
★  cdo
★  rpc over http
★  rpc
★  ews
★  exchange web services
  maci
  imap4
  evolution exchange
  extended mapi
  imapi

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No companions for mapi have been suggested so far.
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Google Trends

Scale is based on the average worldwide traffic of mapi in all years. Click on graph for more.
mapi
imap
smtp