they supported Gmail push email (via Google Sync) and Microsoft's Exchange ActiveSync platform, allowing them to synchronize email, calendars and contacts with mail servers. Apple's iCloud service offers support for push email, contacts, and calendars, although as of the 24 February 2012, this has been temporarily disabled in Germany due to lawsuits. However, by setting up a new account using IMAP IDLE, push email is restored. Android Android's built-in Gmail client uses Google Cloud Messaging to push email for Gmail accounts set up to sync with the phone. Android also supports Microsoft Exchange accounts natively through its default mail application. When "Push" is configured, emails arriving into the Microsoft Exchange inbox are instantly pushed to the device. Calendar events sync both ways between Exchange and the device. Yahoo Mail may be pushed to an Android device, as Android now supports IMAP4 (as of September 2015). An alternative for Yahoo Mail is to install the free Yahoo Mail app, which provides instant push email. Numerous Yahoo users have complained that push does not function reliably; Yahoo has attributed this to server issues rather than the Smartphone app. In 2010 Hotmail, and its replacement, Outlook.com, have been made push configurable for Android smartphones through the default mail application. Windows Mobile and Windows Phone Microsoft began offering real-time email notification with Windows Mobile 2003 (sending SMS messages when new mail arrived), then replaced it with a simulated push experience (long polling) in 2007 with the release of Windows Mobile 5 AKU2 under the name "Direct Push Technology". 'Direct Push' technology is an additional feature added to Microsoft Exchange 2003 with service pack 2 that adds messaging and security features. A phone device running Windows Mobile 5 is enabled to poll the Exchange Server every 30 minutes. If new mail arrives in the polling interval, it is instantly pulled, using a subscriber's existing wireless phone account. This allows the device to have a changing IP or to traverse NAT/Proxy. Nokia Symbian Series 60 Some Nokia Symbian S60 models support basic IMAP IDLE functionality with its built-in client. But on newer E72, E52 etc. phones this functionality is broken, because connection to the mail server is closed (probably even outside the mailing application) and never restored. Nokia Mail for Exchange The Nokia asha smartphones and select models of Nseries smartphones and newer s60 and Symbian^3 handsets running symbian os 9.x or Symbian^3 support the Mail