I've been using it as a customer for about three months now since July.

I have been using Yammer for two to three years.

I've been a Yammer user for quite a while.

I have used Yammer for around five years.

I have been using Yammer for a year. I use the solution's latest version. I am a user of the solution.

I have been using Yammer for three years.

I have been using Yammer for one year.

My organization has been using the solution since last year.

We have been using Yammer for four months.

I have been using Yammer for four to five years.

We have been using this solution for about two years.

I have used this solution for five years.

I have experience with Yammer. I used Yammer six months ago.

We have been using the product since June 2014.

I have used Yammer since 2011/2012.

I used this solution at Kantar, the market research arm of WPP, for three and a half years.

going on 2 years

We have been using the solution for one and a half years.

I have been using Yammer for five years.

I have been using this solution since I started my current position as a software engineer about two years ago.

I have used Yammer for four years.

I have been using this since 2014.

I have used this solution for six years.

I have been using Yammer for one year.

I have been using Yammer for three years.

1 year

I have used it for 6 years.

I have used this product for about six months.

I have used Yammer for about three years.

We have been using this for four years.

I have used this solution for a little over three years.

We have been using this solution for eighteen months.

I have used this solution for a year.

Two years.

I have used this solution for three years.

I have used this solution for three years.

I have used it for about three years.

We have been using the solution for over five years.

We used the product recently for a short period of time less than a year ago.  

I have used this solution for three years.

I have used Yammer for nine months.