Versions

15.0.4619.1000	2.31%
15.0.4617.1000	11.54%
15.0.4615.1000	3.85%
15.0.4615.1000	3.33%
15.0.4551.1007	0.26%
15.0.4547.1000	4.10%
15.0.4535.1000	5.90%
15.0.4535.1000	1.54%
15.0.4517.1504	3.85%
15.0.4511.1000	0.77%
15.0.4481.1501	1.28%
15.0.4481.1000	0.77%
15.0.4466.1000	10.51%
15.0.4454.1504	1.28%
15.0.4420.1017	33.59%
15.0.4128.1022	7.44%
15.0.4128.1019	0.26%
15.0.4128.1014	7.44%

ochelper.dll has 18 known versions, the most recent one is 15.0.4619.1000. It is installed as an Internet Explorer extension as a Browser Helper Object, often without any obvious user interface, and will start when IE loads. The average file size is about 173.01 KB. It is an authenticode code-signed executable issued to Microsoft Corporation by the certification authority Microsoft Corporation. This is a .NET Common Language Runtime (CLR) assembly.

Microsoft Lync (formerly Microsoft Office Communicator) and Microsoft Lync for Mac are instant messaging clients used with Microsoft Lync Server or Lync Online available with Microsoft Office 365 and Live@Edu. Both Microsoft Lync and Microsoft Lync for Mac are enterprise software; unlike Windows Live Messenger, they have a different feature set that is targeted toward corporate environments.