Surviving Office360 without Windows

Create a VM or Container

  • Run Davmail, `Squid`_, and any required VPN.

  • Either the an RPM-packaged or DEB-packaged OS is fine.

Davmail

  • Install Davmail [1]

    • The example is for RHEL-like systems

    • Debian-ish systems require “sid”

1wget https://download.opensuse.org/repositories/home:mguessan:davmail/CentOS_7/home:mguessan:davmail.repo -o /etc/yum.repos.d/davmail.repo
2yum install davmail

  • Configure Davmail [2]

# DavMail settings, see http://davmail.sourceforge.net/ for documentation

#############################################################
# Basic settings

# Server or workstation mode
davmail.server=true
# connection mode auto, EWS or WebDav
davmail.mode=EWS
# base Exchange OWA or EWS url
davmail.url=https://outlook.office365.com/EWS/Exchange.asmx

# Listener ports
davmail.caldavPort=1080
davmail.imapPort=1143
davmail.ldapPort=1389
davmail.popPort=1110
davmail.smtpPort=1025

#############################################################
# Network settings

# Network proxy settings
davmail.enableProxy=false
davmail.useSystemProxies=false
davmail.proxyHost=
davmail.proxyPort=
davmail.proxyUser=
davmail.proxyPassword=

# proxy exclude list
davmail.noProxyFor=

# allow remote connection to DavMail
davmail.allowRemote=true
# bind server sockets to a specific address
davmail.bindAddress=
# client connection timeout in seconds - default 300, 0 to disable
davmail.clientSoTimeout=

# DavMail listeners SSL configuration
davmail.ssl.keystoreType=
davmail.ssl.keystoreFile=
davmail.ssl.keystorePass=
davmail.ssl.keyPass=

# Accept specified certificate even if invalid according to trust store
davmail.server.certificate.hash=

# disable SSL for specified listeners
davmail.ssl.nosecurecaldav=false
davmail.ssl.nosecureimap=false
davmail.ssl.nosecureldap=false
davmail.ssl.nosecurepop=false
davmail.ssl.nosecuresmtp=false

# disable update check
davmail.disableUpdateCheck=true

# Send keepalive character during large folder and messages download
davmail.enableKeepalive=false
# Message count limit on folder retrieval
davmail.folderSizeLimit=0
# Default windows domain for NTLM and basic authentication
davmail.defaultDomain=

#############################################################
# Caldav settings

# override default alarm sound
davmail.caldavAlarmSound=
# retrieve calendar events not older than 90 days
davmail.caldavPastDelay=90
# EWS only: enable server managed meeting notifications
davmail.caldavAutoSchedule=true
# WebDav only: force event update to trigger ActiveSync clients update
davmail.forceActiveSyncUpdate=false

#############################################################
# IMAP settings

# Delete messages immediately on IMAP STORE \Deleted flag
davmail.imapAutoExpunge=true
# Enable IDLE support, set polling delay in minutes
davmail.imapIdleDelay=
# Always reply to IMAP RFC822.SIZE requests with Exchange approximate message size for performance reasons
davmail.imapAlwaysApproxMsgSize=

#############################################################
# POP settings

# Delete messages on server after 30 days
davmail.keepDelay=30
# Delete messages in server sent folder after 90 days
davmail.sentKeepDelay=90
# Mark retrieved messages read on server
davmail.popMarkReadOnRetr=false

#############################################################
# SMTP settings

# let Exchange save a copy of sent messages in Sent folder
davmail.smtpSaveInSent=true

#############################################################
# Loggings settings

# log file path, leave empty for default path
davmail.logFilePath=/var/log/davmail.log
# maximum log file size, use Log4J syntax, set to 0 to use an external rotation mechanism, e.g. logrotate
davmail.logFileSize=1MB
# log levels
log4j.logger.davmail=WARN
log4j.logger.httpclient.wire=WARN
log4j.logger.org.apache.commons.httpclient=WARN
log4j.rootLogger=WARN

#############################################################
# Workstation only settings

# smartcard access settings
davmail.ssl.pkcs11Config=
davmail.ssl.pkcs11Library=

# SSL settings for mutual authentication
davmail.ssl.clientKeystoreType=
davmail.ssl.clientKeystoreFile=
davmail.ssl.clientKeystorePass=

# disable all balloon notifications
#davmail.disableGuiNotifications=false
davmail.disableGuiNotifications=true
# disable tray icon color switch on activity
#davmail.disableTrayActivitySwitch=false
davmail.disableTrayActivitySwitch=true
# disable startup balloon notifications
#davmail.showStartupBanner=true
davmail.showStartupBanner=false

# enable transparent client Kerberos authentication
davmail.enableKerberos=false