Combining Rows With Duplicate Values

I am working with an Excel file of raw data aggregated from an annual customer relationship survey that has been sent out since 2010. The file has approximately 20,000 rows, meaning the survey has been taken around 20,000 times. Unfortunately, each time a customer takes the survey, it is included in the raw data as a separate entry. Therefore the file has numerous duplicate email addresses, corresponding with unique data for each time the survey was taken. Another issue regarding the data, is that in the first year the survey was sent out, the distribution mechanism "broke" and the survey was sent out multiple times (and completed multiple times) in the same year by the same customer, so the surveys are not necessarily uniformly distributed, if that makes sense.

I have been interested in isolating the common respondents (those who have taken the survey across multiple years, albeit not necessarily consecutive years). Up to this point, these respondents have been isolated manually using a pivot table, however I am now looking to enter the raw data into SPSS (a statistical analysis package), in order to view the drivers of these common respondents.

Therefore, I would like to be able to isolate these common respondents and the data corresponding with their surveys from the raw data in a separate worksheet or file. I have tried various formulas to do so in Excel to no avail. Is there anyway to accomplish this in Access or would a more complex database be needed?

Ideally the final product would have the common respondents' information from multiple surveys in one row and would be able to be filtered by feedback date (found in the raw data), so that hypothetically one could select a month and be able to tell how many customers considered to be common respondents completed a survey within that month.