Good news for all suffering on missing ActiveSync on the Exchange Server !?
A few days ago I found a new app in the store "Outlook WP Access". This app seems to work like e.g. mail+ which is available for android and iOS. Being not an IT guy I would describe it as folows: It uses outlook OWA but persists the data (mails, contacts) on the phone. The app is not yet working with Exchange Server 2013, but this is shall be possible by end of June 2014. I will chheck out then and report on it in more detail (functionality and limitations, impact on battery and data transfer).
My company has disabled ActiveSync for ALL mobile devices, indepently of the operating system. We are using the GOOD app, but it is limited in terms of storing contact details in the phone's storage and opening attachments what makes it a little bit uncomfortable to work with. To replicate contacts and calendar entries to my phone I am currently using AKRUTO. But because I am mostly on travel I can only replicate when PC and Phone are in the same WiFi-network. This was my workaround so far as no app like mail+ was available. Keep fingers crossed that "Outlook WP Access" will be the expected soution...
Update (11 July 2014):
I had the opportunity to test the beta version of the app with exchange server 2013 and want to share my impreesions and findings with you.
First of all, I was very lucky to have the app durcing the past days because my company's GOOD server had severe problems and without "Outlook WP Access" I would have to access my emails using the web browser.
In general: The app works quite similar to OWA. Up to now it supports only the e-mail function. Contacts are stored in the app from mails you receive. They are then imported either from the exchange adress book, from your outlook contacts or (if not included there) stored from the mail in a categorie "other contacts". The contacts stored in the app are only available in the app itself! You cannot access them from other apps, export them to the phones adress book. Moreover it is not possible to e.g. place a phone call by selecting a contact in the apps contact list.
The mail function is stable and works fine as long as you are online (see below). It works in pull mode. The app checks for new mails frequently. Live Tile and Lock Screen Indicator work well. When writing mails you can only choose contacts stored in the contact list as recipients. Up to now you cannot add attachments. The mail body is not stored in the app (only recipient and subject). Mail-Editing in offline mode is not possible up to now.
Contacts function is very limited because it is only used in the app and only for the email function.
A Calendar function is not available up to now.
Summary: The first of its kind for WP. Already very good e-mail function. Some improvements required (e.g. offline editing).
I very frequently had contact with the developer during testing and made several suggestions re further improvements (mail, contacts, calendar). He is very commited and I expect him to continue improving the app in the future.